Add "OpenSSF Scorecard" workflow.

Author: fabiocaccamo

.github/workflows/openssf-scorecard.yml

@@ -0,0 +1,37 @@
+name: OpenSSF Scorecard
+
+on:
+  push:
+    branches: [main]
+  schedule:
+    - cron: '0 8 * * 6'  # every Saturday at 08:00 UTC
+  workflow_dispatch:
+
+permissions: read-all
+
+jobs:
+  scorecard:
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write   # needed to upload SARIF results to GitHub Security tab
+      id-token: write          # needed for Scorecard's OIDC token
+      contents: read
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+        with:
+          persist-credentials: false
+
+      - name: Run Scorecard
+        uses: ossf/scorecard-action@4eaacf0543bb3f2c246792bd56e8cdeffafb205a # v2.4.3
+        with:
+          results_file: scorecard-results.sarif
+          results_format: sarif
+          publish_results: true
+
+      - name: Upload results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@5c8a8a642e79153f5d047b10ec1cba1d1cc65699 # v3
+        with:
+          sarif_file: scorecard-results.sarif
+          category: scorecard